Eb 13#11, 3rd inversion (C# in the bass)
Also written as Eb13#11/C#.
Notes, from the bass up
C# (bass)E#AB#D#GA#
The same notes as Eb 13#11 (C#, E#, A, B#, D#, G and A#), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.